Abid, S., M. Derouiche, G. Abdelmoula, S. Boughizane, S. Hidar, and A. Chaieb. “Chronic Tubal Ectopic Pregnancy With a Negative Serum Human Chorionic Gonadotropin Test: A Case ‎ Report”. Biomedicine & Healthcare Research, vol. 1, no. 1, June 2023, pp. 27-29, doi:10.71599/bhr.v1i1.30.